An enormous goose sits atop this nest-shaped home.

The United States's largest hand-dug well is topped with a state-of-the-art museum.

This army of concretions is an unexplained geological phenomenon unlike anything else in the world.

The cave holds a spectacular array of stalactites and stalagmites, including one shaped like a giant human heart.

This fantastic cave remained unexplored until 1948 when three schoolboys discovered a hidden entrance.

The site of an underground detonation of a megaton nuclear bomb in the middle of the Mojave Desert.

Part of a secret 1970s nuclear defense program is now open to the public.

An unexpected but incredible collection of wildlife dioramas spanning rainforests, swamps, forests, and plains.

Giant granite rocks standing end-to-end like a train of circus elephants.

This is not your typical jungle gym.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

Less a museum than a bizarre fantasy world created by artists and engineers.

Water of undetermined depth has attracted rare fish and cult leaders alike.

The largest arcade museum in the world chronicles the golden age of video games which ended promptly in 1987.

Mirrored floors and arched shelves create the illusion of an infinite tunnel of books.

A galaxy of glowworms—larvae of a gnat—hides deep in the belly of these caves.

The only Florida state park with publicly accessible caves.

At high tide this strange footbridge appears to have no purpose whatsoever.

Norway has built what may be the world's most beautiful public toilet.

The 43-mile route crosses through six islands with gorgeous views of the Seto Inland Sea.

A tall karst islet popularized by 007.

It might not be as impossible to reach as its name would imply, but just about.

Colorful lights and mirror-like brine pools create trippy illusions within the historic mine.

A geological bull's-eye visible from outer space.